(function ($, _) {
    "use strict";
    var $aside = $("aside"),
        normalTop = $aside.position().top;

    $(document).scroll(function () {
        if ($(document).scrollTop() >= normalTop) {
            $aside.addClass("fixed-aside");
        } else {
            $aside.removeClass("fixed-aside");
        }
    });
}(window.jQuery, window._));